Flexible display module and electronic device

Abstract

The application provides a flexible display module and electronic equipment, which are applied to the technical field of display. The module comprises: a support layer with a preset bending stiffness; a flexible display panel arranged on a first surface of the support layer; a magnetic attraction assembly arranged on a second surface of the support layer away from the first surface, the magnetic attraction assembly being configured to be magnetically connected with a target curved substrate; wherein the magnetic attraction assembly comprises a magnetic attraction unit and an elastic buffer unit, and the elastic buffer unit is arranged on the periphery of the magnetic attraction unit. By using the display module, the flatness, the anti-vibration reliability and the quick disassembly of the flexible display module when being attached to a large curvature can be simultaneously considered by arranging the support layer with the preset bending stiffness and arranging the magnetic attraction assembly comprising the magnetic attraction unit and the elastic buffer unit on the surface of the support layer away from the flexible display panel.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a flexible display module and electronic device. Background Technology

[0002] With the development of display technology, flexible display panels are widely used in terminal devices with complex curvatures. In curved surface bonding scenarios, a support layer is usually required on the back of the flexible display panel to ensure its flatness and suppress wrinkles. However, existing support structures often struggle to balance the stability of large-curvature bonding with ease of maintenance.

[0003] On the one hand, while high-rigidity glass or thick metal support plates provide sufficient bending stiffness, they are prone to brittle fracture or fatigue failure under repeated bending or vibration conditions, and also increase the overall weight. On the other hand, while low-modulus purely flexible substrates have good bending performance, their bending stiffness is insufficient, resulting in significant springback after bonding. Furthermore, they are prone to micro-slippage with the housing under long-term vibration, leading to loosening of the connection. In addition, existing fixing methods mostly use screw fastening or permanent adhesive bonding. The former is time-consuming to install and remove and easily damages the threads, while the latter makes the module irreparable and results in high after-sales costs. Even with magnetic fixing, direct contact with traditional hard magnets can easily create stress concentration points (hard spots), which can easily cause mechanical damage to the display panel pixel layer or fatigue loosening of the magnetic structure during vibration transmission. Therefore, there is an urgent need for a flexible display module structure that can balance curved surface flatness, vibration resistance reliability, and tool-free quick disassembly. Summary of the Invention

[0004] The purpose of this application is to provide a flexible display module and electronic device, solving the problems of existing curved flexible display modules that are difficult to balance in terms of flatness of large curvature fit, vibration resistance reliability, and quick disassembly. To achieve the above objectives, this application adopts the following technical solution: One aspect of this application provides a flexible display module, comprising: a support layer having a preset bending stiffness; a flexible display panel disposed on a first surface of the support layer; and a magnetic suction assembly disposed on a second surface of the support layer opposite to the first surface, wherein the magnetic suction assembly is configured to magnetically connect with a target curved substrate; wherein the magnetic suction assembly includes a magnetic suction unit and an elastic buffer unit, the elastic buffer unit being disposed around the magnetic suction unit.

[0005] Optionally, when the magnetic component is in a state of magnetic connection with the target curved substrate, the surface of the elastic buffer unit away from the support layer is flush with the surface of the magnetic component away from the support layer; or, the vertical distance between the surface of the elastic buffer unit away from the support layer and the second surface is less than the vertical distance between the surface of the magnetic component away from the support layer and the second surface.

[0006] Optionally, in one implementation, the number of magnetic components is multiple, and the multiple magnetic components are arranged in an array on the support layer, or the multiple magnetic components are distributed in a ring on the second surface along the edge region of the support layer.

[0007] As one implementation, optionally, a window area corresponding to the magnetic attraction unit is provided on the second surface of the support layer, the window area penetrating at least a portion of the thickness of the substrate layer, and a portion of the magnetic attraction unit is embedded in the window area.

[0008] As one implementation, the elastic buffer unit may optionally fill the gap between the magnetic unit and the sidewall of the window area.

[0009] Optionally, in one implementation, the support layer includes a substrate, and the surface of the substrate facing away from the flexible display panel is formed as the second surface. A plurality of mutually separated rigid microdisks are also disposed on the second surface. The magnetic suction assembly is disposed in the region between the plurality of rigid microdisks, and the vertical distance between the surface of the rigid microdisk facing away from the substrate and the second surface is less than the vertical distance between the surface of the magnetic suction unit facing away from the substrate and the second surface.

[0010] As one implementation, the flexible display module may optionally include a heat dissipation material layer disposed on the side of the support layer opposite to the flexible display panel, wherein the heat dissipation material layer has an opening that avoids the magnetic attraction component.

[0011] As one implementation, the material used to make the support layer may optionally include at least one of stainless steel foil, polyimide-metal composite foil, polyethylene terephthalate rigid backing plate, or nickel-iron alloy foil.

[0012] Optionally, in one implementation, the magnetic attraction unit includes a neodymium iron boron magnet, and the elastic buffer unit includes a foam layer; the thickness of the neodymium iron boron magnet is between 0.05 mm and 0.15 mm, and the thickness of the foam layer is between 0.03 mm and 0.10 mm.

[0013] This application also provides an electronic device, including: a flexible display module as described above.

[0014] As one implementation, the electronic device may optionally include a curved housing, wherein the flexible display module is detachably attached to the inner surface of the curved housing via the magnetic attachment assembly.

[0015] As one implementation, the curved shell may optionally be an iron-nickel alloy shell.

[0016] At least one of the above technical solutions in the specific embodiments of this application has the following beneficial effects: The flexible display module and electronic device provided in this application provide support for the flexible display panel through a support layer with a preset bending stiffness, effectively resisting the compressive and tensile stress during curved surface bonding, preventing wrinkling of the display panel and causing unevenness when bonding with the target curved substrate; at the same time, by setting a magnetic assembly containing a magnetic unit and an outer elastic buffer unit on the back of the support layer, the magnetic unit provides a detachable connection holding force, and the surrounding elastic buffer unit provides a stable bonding effect, avoiding rigid hard contact between the magnetic unit and the target curved substrate, thereby achieving tool-free quick assembly and disassembly while blocking the transmission path of external vibration to the display panel, eliminating the potential damage to the display layer caused by local stress concentration, and thus improving the vibration resistance reliability. Attached Figure Description

[0017] Figure 1 This is a cross-sectional structural diagram of the flexible display module described in Embodiment 1 of this application; Figure 2 This is a schematic diagram of the planar structure of the support layer in Embodiment 1 of this application; Figure 3 This is a cross-sectional structural diagram of the flexible display module described in Embodiment 2 of this application; Figure 4 This is a cross-sectional structural diagram of the flexible display module described in Embodiment 3 of this application; Figure 5 This is a schematic diagram of the planar structure of the support layer in Embodiment 3 of this application. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "connected" or "linked," and similar terms, are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship also changes accordingly.

[0020] To address the challenges of existing curved flexible display modules in simultaneously achieving flatness during high-curvature bonding, vibration resistance, and rapid disassembly, this application provides a flexible display module and electronic device. A support layer with preset bending stiffness provides support for the flexible display panel, effectively resisting compressive and tensile stresses during curved bonding and preventing wrinkling that could lead to unevenness when bonding with the target curved substrate. Simultaneously, a magnetic assembly comprising a magnetic unit and surrounding elastic buffer units is provided on the back of the support layer. The magnetic unit provides detachable connection and retention force, while the surrounding elastic buffer units provide stable bonding, avoiding rigid hard contact between the magnetic unit and the target curved substrate. This achieves tool-free rapid assembly and disassembly while blocking the transmission path of external vibrations to the display panel, eliminating potential damage to the display layer from localized stress concentrations, and thus improving vibration resistance and reliability.

[0021] like Figure 1 and Figure 2 As shown, one embodiment of this application provides a flexible display module, which includes: The support layer 20 with preset bending stiffness, the flexible display panel 10, and the magnetic component 30 are included.

[0022] The flexible display panel 10 is disposed on the first surface 21 of the support layer 20, and the magnetic suction component 30 is disposed on the second surface 22 of the support layer 20 opposite to the first surface 21. The magnetic suction component 30 is configured to be magnetically connected to the target curved substrate. The magnetic suction component 30 includes a magnetic suction unit 31 and an elastic buffer unit 32, with the elastic buffer unit 32 disposed around the magnetic suction unit 31.

[0023] The flexible display module with this implementation structure, by setting a support layer 20 with a preset bending stiffness, and setting a magnetic assembly 30 including a magnetic suction unit 31 and an elastic buffer unit 32 on the surface of the support layer 20 facing away from the flexible display panel 10, can simultaneously take into account the flatness, vibration resistance reliability and quick disassembly of the flexible display module when it is bonded with a large curvature.

[0024] The support layer 20, serving as the mechanical framework of the flexible display module, possesses a pre-set bending stiffness that provides sufficient in-plane support for the flexible display panel 10 to resist compressive and tensile stresses during curved surface bonding, thereby effectively suppressing pixel wrinkles. Simultaneously, this stiffness allows the support layer 20 to elastically deform according to the curvature of the target curved substrate, avoiding bonding gaps or springback issues caused by excessive rigidity. For example, the support layer 20 can be made of materials such as metal foil, polymer composite film, or rigid backing plate, as long as its modulus and thickness combination meets the anti-wrinkle and conformal requirements under a specific radius of curvature. This embodiment does not impose specific limitations on this.

[0025] In some embodiments, the material used to make the support layer 20 includes at least one of stainless steel foil, polyimide PI-metal composite foil, polyethylene terephthalate (PET) rigid backing, or nickel-iron alloy foil.

[0026] Optionally, the support layer 20 comprises stainless steel foil, such as SUS301 / 304, with a thickness between 50 and 150 µm, a Young's modulus of approximately 200 GPa, a Poisson's ratio of 0.30, and a density of 7.9 g / cm³. -3 In this embodiment, the high rigidity of the stainless steel foil effectively suppresses wrinkles in the flexible display panel 10.

[0027] Optionally, the support layer 20 comprises a polyimide (PI)-metal composite foil, formed by bonding a polyimide (PI) layer with a thickness of 25 µm to 50 µm to a metal foil with a thickness of 25 µm to 50 µm; wherein the polyimide (PI) layer has a modulus of 2–10 GPa and a density of approximately 1.4 g cm⁻¹. -3 By using PI-metal composite foil to make the support layer 20, the support layer 20 can combine the advantages of being lightweight, having high dielectric strength and high bending life, making it more suitable for curved surfaces with stringent requirements for weight and bending resistance.

[0028] Optionally, the support layer 20 includes a rigid PET backing with a thickness between 50 µm and 125 µm, a modulus of 3 to 5 GPa, and a density of 1.37 g cm⁻¹. -3 Using a rigid PET backing to make the support layer 20 can minimize the manufacturing cost of the support layer 20 and allow for a wider process window.

[0029] Optionally, the support layer 20 comprises a nickel-iron alloy foil, or permalloy, with a thickness between 25 and 100 µm, a modulus of approximately 210 GPa, and a density of 8.2 g / cm³. -3 By using nickel-iron alloy foil to make the support layer 20, the magnetic permeability of the support layer 20 can be as high as 10. 4 The magnetic attraction component 30 is provided on the support layer 20. The support layer 20 can form a closed magnetic circuit with the magnetic attraction unit 31 of the magnetic attraction component 30. With magnetic attraction unit 31 of the same area, the attraction force can be increased by more than 20%, so that the support layer 20 becomes a functional reinforcement layer.

[0030] In one embodiment of this application, laser microgrooves may optionally be formed on the support layer 20. For example, when the support layer 20 includes stainless steel foil, laser microgrooves are formed on the stainless steel foil. When the flexible display panel 10 is magnetically connected to the target curved substrate through the support layer 20, the laser microgrooves are used to release the tensile stress of the curved surface.

[0031] refer to Figure 1 As shown, the flexible display panel 10 is formed as a multi-layer stacked structure, sequentially including a back film layer 11, an encapsulation and display panel layer 12, a polarizer 13, an optical adhesive layer 14, and a cover layer 15 along the direction away from the support layer 20. The cover layer 15 is located on the outermost side of the flexible display panel 10, serving as the light-emitting surface directly viewed by the user. It can be made of flexible transparent polyimide film or ultra-thin tempered glass, providing surface hardness protection and scratch resistance for the underlying functional film layers. The optical adhesive layer 14 is disposed between the cover layer 15 and the polarizer 13, serving as an optical coupling and interlayer bonding agent.

[0032] The polarizer 13 is used to suppress the reflection of ambient light on the surface of the display panel, improving display contrast and visibility. The encapsulation and display panel layer 12 is the core functional area of ​​the flexible display panel 10, integrating an array of organic light-emitting devices and corresponding thin-film transistor driving circuits. The back film layer 11 covers the back of the encapsulation and display panel layer 12, providing mechanical protection and moisture barrier functions for the entire flexible display panel 10, and also providing a flat bonding interface for the interlayer connection between the flexible display panel 10 and the support layer 20.

[0033] Optionally, the support layer 20 can be adhered to the back film layer of the flexible display panel 10 via an adhesive layer to achieve a fixed connection between the two. The material of the adhesive layer can be selected from at least one of optically transparent adhesive, pressure-sensitive adhesive, or foam adhesive, depending on actual needs. This application does not impose any particular limitations on the specific material selection and thickness design of the adhesive layer, as long as it can establish a reliable mechanical connection between the flexible display panel 10 and the support layer 20.

[0034] In this embodiment, combined with Figure 1and Figure 2 As shown, the magnetic suction assembly 30 includes a magnetic suction unit 31 and an elastic buffer unit 32, with the elastic buffer unit 32 disposed around the magnetic suction unit 31. This structure creates a flexible-rigid composite in space, where the high-rigidity magnetic suction unit 31 and the low-rigidity elastic buffer unit 32 are combined. The magnetic suction unit 31 provides a normal adsorption force perpendicular to the bonding surface, enabling rapid fixing and disassembly of the module. The elastic buffer unit 32, surrounding the magnetic suction unit 31, acts as a stress isolation medium. On one hand, it fills the step difference between the magnetic suction unit 31 and the surrounding area under static conditions, preventing localized hard points from causing indentations or damage to the flexible display panel 10. On the other hand, under dynamic vibration conditions, it absorbs and dissipates externally transmitted vibration energy through its elastic deformation, blocking the transmission path of high-frequency vibrations to the brittle display functional layer.

[0035] It should be understood that, although Figure 1 The diagram schematically shows the elastic buffer unit 32 in the form of a ring surrounding the magnetic suction unit 31. However, in other embodiments, the elastic buffer unit 32 may also be a strip or block structure disposed on one or more sides of the magnetic suction unit 31. As long as it can form an effective stiffness buffer transition area around the magnetic suction unit 31, it falls within the protection scope of this application.

[0036] In one preferred embodiment, the number of magnetic absorbing components 30 is multiple. These components are arranged in an array on the support layer 20, or they are arranged in a ring along the edge region of the support layer 20 on the second surface 22. Optionally, when arranged in an array, the multiple magnetic absorbing components 30 are evenly distributed across the entire back surface of the support layer 20. This disperses the concentrated connection force between the flexible display panel 10 and the target curved substrate across the entire bonding surface, making it particularly suitable for bonding curved surfaces with large areas or gentle curvature changes. This helps ensure the uniformity of force and the flatness of the bonding of the entire module. When arranged in a ring along the edge region, the magnetic absorbing components 30 are concentrated around the periphery of the support layer 20. This method can specifically strengthen the fixing effect of the edge regions most prone to warping or peeling, while freeing up space in the central region. This helps reduce the weight of the module or reserve installation positions for other functional devices (such as sensors or heat sinks) in the central region.

[0037] In practical applications, array arrangement and ring arrangement can be combined according to the specific shape and stress characteristics of the target curved substrate. For example, a high-density ring arrangement can be used at the edge while a low-density array arrangement can be used at the center to achieve the best balance between bonding reliability and lightweight design.

[0038] The flexible display module adopted in this application embodiment, through the stacked structure of the support layer, flexible display panel and magnetic components, and by utilizing the flexible arrangement of the magnetic components on the support layer, can achieve the bonding of the flexible display module with target curved substrates of different shapes, and prevent the display panel from wrinkling. While ensuring vibration resistance and reliability, it can also achieve rapid disassembly between the flexible display module and the target curved substrate.

[0039] In some of these embodiments, optionally, such as Figure 1 As shown, when the magnetic suction assembly 30 is in a state of magnetic connection with the target curved substrate, the surface of the elastic buffer unit 32 away from the support layer 20 is flush with the surface of the magnetic suction unit 31 away from the support layer 20, or the vertical distance between the surface of the elastic buffer unit 32 away from the support layer 20 and the second surface 22 is less than the vertical distance between the surface of the magnetic suction unit 31 away from the support layer 20 and the second surface 22.

[0040] Optionally, in its natural state, the original thickness of the elastic buffer unit 32 is greater than the thickness of the magnetic unit 31 to ensure that the elastic buffer unit 32 can be compressed to produce a predetermined deformation when the flexible display module is assembled and adsorbed onto the target curved substrate. When in a magnetic connection state, if the surfaces of the two are flush, the elastic buffer unit 32 is compressed to the same height as the magnetic unit 31. At this time, the elastic buffer unit 32 provides sufficient damping and buffering without increasing the magnetic circuit gap due to protruding from the magnetic unit 31. If the surface of the elastic buffer unit 32 is slightly lower than the surface of the magnetic unit 31, the magnetic unit 31 undertakes the main support and adsorption functions, while the elastic buffer unit 32 is in a continuously energy-storing compressed state to prevent the module from micro-slipping or loosening under long-term vibration conditions, so as to ensure better adhesion and achieve better wrinkle reduction effect in conjunction with the magnetic unit 31.

[0041] In a preferred embodiment, the magnetic attraction unit 31 includes a neodymium iron boron magnet, and the elastic buffer unit 32 includes a foam layer; optionally, the thickness of the neodymium iron boron magnet is between 0.05 mm and 0.15 mm, and the thickness of the foam layer is between 0.03 mm and 0.10 mm.

[0042] In this embodiment, the flexible display module has been designed and matched with the materials and thicknesses of the magnetic attraction unit 31 and the elastic buffer unit 32 in a refined manner. While ensuring a certain magnetic attraction force, it can also absorb vibration and ensure a better fit.

[0043] For example, in a typical robotic facial display application, a 0.1 mm thick N52 neodymium iron boron magnet can be used in combination with a 0.05 mm thick microporous polyurethane foam. This combination results in a foam compression of approximately 0.02 mm to 0.03 mm under pressure, while maintaining a minimum pressure of 8 N / cm².2 The magnetic attraction retains the magnetic force and reduces the peak vibration acceleration transmitted to the flexible display panel 10 by more than 40%. It is worth noting that the thickness range specified in this application is based on a critical optimal solution derived from extensive experimental verification, and is not an arbitrary design choice. By strictly controlling the thickness of the neodymium iron boron magnet and the foam layer within a reasonable range, the optimal balance between magnetic attraction reliability and buffer absorption effectiveness is achieved.

[0044] Combination Figure 1 and Figure 2 As illustrated, in this embodiment of the flexible display module, the support layer 20 is made of 100 µm thick SUS301 stainless steel foil. A polarizer 13 with a thickness of approximately 0.2 mm and an encapsulation and display panel layer 12 (e.g., a flexible OLED panel, including touch and encapsulation functional layers) with a thickness of approximately 0.1 mm are bonded to the side of the support layer 20 opposite to the second surface 22. The second surface 22 of the support layer 20 is arrayed with 0.1 mm thick magnetic units, such as N52 neodymium iron boron magnets (Ni-Cu-Ni plating 3 µm), at 25 mm intervals. Each unit is surrounded by an approximately 0.05 mm thick (e.g., Poron 4701-30) annular elastic buffer unit 32 (e.g., a foam layer), with an inner diameter of approximately 6 mm and an outer diameter of approximately 10 mm. Using this structure, the magnetic holding force can be greater than or equal to 8 N / cm. 2 The module has a total thickness of approximately 0.95 mm and an overall bending modulus maintained at the level of 200 GPa. It can completely suppress pixel wrinkles on curved surfaces with a bending radius greater than or equal to 10 mm and can remain stable under random vibration of approximately 5 g, achieving a low-cost, high-rigidity, and quick-disassembly structure.

[0045] Another embodiment of this application provides a flexible display module, such as... Figure 3 As shown, with Figure 1 The flexible display module shown in the embodiment has the same structure, including: a support layer 20 with a preset bending stiffness, a flexible display panel 10, and a magnetic suction component 30. Among them, it is similar to... Figure 1 The structures in the illustrated embodiments are the same. The flexible display panel 10 is disposed on the first surface 21 of the support layer 20, and the magnetic suction component 30 is disposed on the second surface 22 of the support layer 20 away from the first surface 21. The magnetic suction component 30 is configured to be magnetically connected to the target curved substrate. The magnetic suction component 30 includes a magnetic suction unit 31 and an elastic buffer unit 32, and the elastic buffer unit 32 is disposed around the magnetic suction unit 31.

[0046] In this embodiment, the material used to manufacture the support layer 20, and the specific structure of the flexible display panel 10, can be consistent with... Figure 1 The structures in the illustrated embodiments are the same and will not be described again here.

[0047] and Figure 1 The structures in the illustrated embodiments differ; in this embodiment, for example... Figure 3 As shown, a window area 24 corresponding to the magnetic attraction unit 31 is provided on the second surface 22 of the support layer 20. The window area 24 penetrates at least part of the thickness of the support layer 20, and a part of the magnetic attraction unit 31 is embedded in the window area 24.

[0048] By adopting this implementation structure, a portion of the magnetic unit 31 is "sunk" into the support layer 20, making the magnetic unit 31 an embedded structure. This effectively utilizes the thickness space of the support layer itself to accommodate the magnetic unit 31, thereby significantly reducing the total thickness of the module.

[0049] In specific implementation, the shape of the window area 24 can be matched with the outer contour of the magnetic unit 31, and can be a rectangle, a circle or other irregular structure. Its depth can be such that after the magnetic unit 31 is embedded, its surface away from the support layer 20 can still maintain a preset height relationship with the surrounding area. For example, the surface away from the support layer 20 and the surface away from the support layer 20 of the elastic buffer unit 32 are located on the same surface.

[0050] Optionally, the processing method of the window area 24 can be flexibly selected according to the material properties of the support layer 20. For example, when the support layer 20 is made of stainless steel foil, the window area 24 can be formed by laser cutting or chemical etching process to form a high-precision groove; when the support layer 20 is made of polyimide-metal composite foil (PI-metal composite foil), the window area 24 can be formed by photolithography etching or mechanical stamping.

[0051] Based on this, to further improve the overall integrity and reliability of the structure, optionally, the elastic buffer unit 32 fills the gap between the magnetic suction unit 31 and the sidewall of the window area 24. With this implementation, the elastic buffer unit 32 filling the gap acts as a flexible medium layer, preventing direct rigid contact between the magnetic suction unit 31 and the window sidewall of the support layer 20. When the module is subjected to external impact or vibration, the elastic material can effectively absorb the relative displacement energy between them, preventing the magnetic suction unit 31 from falling off.

[0052] For example, using Figure 3The embodiment shown features a support layer 20 made of a PI and permalloy composite layer with a thickness of approximately 2 mm, possessing a closed magnetic circuit with ultra-high permeability. The surface of the support layer 20 facing away from the flexible display panel 10 can be etched to form a window area 24. 0.1 mm thick N52 neodymium iron boron (NdFeB) magnetic sheets are arranged in an array with a 25 mm spacing, and the NdFeB magnetic sheets are semi-submerged within the window area 24. The remaining 0.05 mm protrusion of the NdFeB magnetic sheets is filled by an elastic buffer unit 32. Optionally, this elastic buffer unit 32 can be made of thick silicone foam rings. The height difference between the surface of the NdFeB magnetic sheets facing away from the support layer 20 and the surface of the elastic buffer unit 32 facing away from the support layer 20 is approximately 0.01 mm. The flexible display module using this embodiment can maintain an equivalent bending rigidity of 150 GPa. Multiple experiments have demonstrated that the magnetic sheet displacement is minimal after tens of thousands of bends, making it suitable for curved surfaces of ultra-narrow bezel robots.

[0053] This application also provides another embodiment of a flexible display module, such as Figure 4 and Figure 5 As shown, a plurality of mutually separated rigid microdisks 23 are further disposed on the second surface 22 of the support layer 20; wherein, the magnetic attraction component 30 is disposed in the region between the plurality of rigid microdisks 23, and the vertical distance between the surface of the rigid microdisk 23 facing away from the support layer 20 and the second surface 22 is less than the vertical distance between the surface of the magnetic attraction unit 31 facing away from the support layer 20 and the second surface 22. The support layer 20 is made of at least one of stainless steel foil, polyimide-metal composite foil, polyethylene terephthalate rigid backing plate, or nickel-iron alloy foil.

[0054] The rigid microdisk 23 is formed on the support layer 20 as a hard material distribution area with a preset region and shape. The rigid microdisk 23 has a high modulus. By setting multiple rigid microdisks 23 discretely distributed on the flexible support layer 20, it can provide strong normal support at multiple points for the flexible display panel 10, so as to effectively resist local depression deformation when pressed or bonded, and prevent the pixel layer from collapsing or misaligning due to lack of support. At the same time, the support layer 20 area between adjacent rigid microdisks 23 retains good flexible bending ability, so that the entire support layer 20 can conform to the shape of the large curvature curved substrate and undergo overall deformation, avoiding the rebound stress or edge warping problem generated when the continuous rigid plate is bonded to the curved surface.

[0055] On the other hand, since the vertical distance between the surface of the rigid micro disk 23 away from the support layer 20 and the second surface 22 is smaller than the vertical distance between the surface of the magnetic unit 31 away from the support layer 20 and the second surface 22, the height of the surface of the rigid micro disk 23 away from the support layer 20 is lower than the height of the surface of the magnetic unit 31. This ensures that the magnetic unit 31 can establish magnetic circuit coupling with the target curved substrate during the magnetic connection process, avoiding the problem of increased effective magnetic gap or unstable contact caused by the rigid micro disk 23 protruding from the magnetic surface.

[0056] For example, in a preferred implementation, the support layer 20 can be a polyimide film with a thickness of about 25 μm, and the rigid micro disk 23 can be a rigid micro disk 23 made of stainless steel with a diameter of about 5 mm and a thickness of about 50 μm. The partitioned support structure with an equivalent bending modulus of about 80 GPa is formed by laser dot matrix inlay process, which not only ensures the flatness of the display area, but also provides a sufficient flexible installation interface for the magnetic component 30.

[0057] In this embodiment, with Figure 3 The implementation structure of the illustrated embodiment is the same. A window area is provided on the second surface 22 of the support layer 20 corresponding to the magnetic attraction unit 31. A part of the magnetic attraction unit 31 is embedded in the window area. This implementation structure will not be described in detail here.

[0058] Optionally, in the embodiments of this application, combined with Figure 4 and Figure 5 As shown, the flexible display module also includes a heat dissipation material layer 40 disposed on the side of the support layer 20 away from the flexible display panel 10, and the heat dissipation material layer 40 has an opening that avoids the magnetic attraction component 30. When multiple rigid microdisks 23 are disposed on the support layer 20, the heat dissipation material layer 40 covers the rigid microdisks 23 and avoids the area where the magnetic attraction component 30 is disposed on the rigid microdisks 23.

[0059] Optionally, the heat dissipation material layer 40 can be, but is not limited to, a highly thermally conductive graphite layer. Materials such as copper foil, graphene film, or thermally conductive silicone pads can also be used, as long as they possess in-plane thermal conductivity and can avoid the magnetic attraction area through a window design; all such materials fall within the scope of this application. Optionally, the heat dissipation material layer 40 can be adhered to the side of the support layer 20 opposite to the flexible display panel 10 using an adhesive method.

[0060] By employing this implementation structure, a heat dissipation material layer 40 is provided on the side of the support layer 20 facing away from the flexible display panel 10. This allows for the rapid conduction and dissipation of heat generated during the operation of the flexible display panel 10, or heat from other heat sources inside the electronic device (such as cameras, LiDAR, etc.), avoiding the problem of localized heat accumulation and achieving uniform heat dissipation. Furthermore, it also provides electromagnetic shielding. Additionally, by creating clearance windows for the magnetic attraction component 30 on the heat dissipation material layer 40, it is ensured that the magnetic attraction component 30 can be magnetically connected to the target curved substrate, guaranteeing efficient closure of the magnetic circuit and reliable connection.

[0061] It should be noted that this heat dissipation material layer 40 is not limited to applications only. Figure 4 and Figure 5 In the flexible display module of the illustrated implementation structure, in Figure 1 and Figure 3 In the flexible display module of the embodiment shown, a heat dissipation material layer 40 can also be provided, which will not be described in detail here.

[0062] Combination Figure 4 and Figure 5 As illustrated, in this embodiment of the flexible display module, the support layer 20 uses a PI substrate with a thickness of approximately 150 µm. Rigid microdisks 23 with a thickness of 50 µm and made of SUS304 can be embedded on the second surface of the support layer 20 using a laser dot matrix method, forming a partitioned rigid support with an equivalent bending modulus of approximately 80 GPa, thus balancing bending resistance and flexibility. Furthermore, on the second surface 22 of the support layer 20, 0.1 mm thick magnetic suction units 31 are arranged in the spaced areas of the multiple rigid microdisks 23. Each magnetic suction unit 31 is surrounded by an approximately 0.05 mm thick annular elastic buffer unit 32 (such as thermally conductive silicone foam). A 0.1 mm thick graphite sheet is attached to the surface of the rigid microdisk 23 facing away from the support layer 20, ensuring that the graphite sheet avoids the magnetic suction assembly 30, forming a heat dissipation material layer 40. Thus, the magnetic suction assembly 30 and the heat dissipation material layer 40 combine to form a magnetic-thermal-conducting conformal layer.

[0063] In another embodiment, for example, the flexible display module of this application uses laser dot matrix embedding of Ø5 mm × 50 µm rigid micro disks 23 (E = 200 GPa, ν = 0.34, ρ = 1.4 g cm-3) made of SUS304 on a 25 µm PI substrate (support layer 20) (E ≈ 3 GPa, ν = 0.34, ρ = 7.9 g cm-8) to form a partitioned rigid support with an equivalent bending modulus of approximately 80 GPa; 0.1 mm N52 neodymium iron boron magnets (Br ≥ 1.42 T, surface Ni-Cu-Ni 3 µm) are adhesively attached to the diskless area of ​​the PI substrate to form a magnetic suction unit 31; an outer ring of 0.05 mm thermally conductive silicone foam TC-2000 (compression modulus 0.12 MPa, thermal conductivity 2 Wm) is used. -1 K -1 The system incorporates a buffer to form an elastic buffer unit 32, with a 0.1 mm graphite sheet (with an in-plane thermal conductivity of 800 W / m²) then bonded to the back. -1 K -1 A Ø9 mm window is provided to avoid the magnetic sheet, forming a heat dissipation material layer 40, constituting a magnetic attraction-thermal conduction conformal layer; the overall thickness of the flexible display module made using this structure is 0.90 mm, and the magnetic attraction holding force is 8.5 N / cm. 2 It can optimize the heat dissipation problem of OLED modules and meet the needs of outdoor high-brightness robots with curved faces.

[0064] This application also provides an electronic device that includes a flexible display module as described in any of the foregoing embodiments.

[0065] The electronic device also includes a curved housing, to which the flexible display module is detachably attached via a magnetic attachment assembly to the inner surface of the curved housing. Optionally, the curved housing is a nickel-iron alloy housing with high magnetic permeability to further optimize the magnetic attraction performance between the flexible display module and the curved housing. In this embodiment, the electronic device can be various smart terminals with curved display requirements, such as a facial display terminal for humanoid or service robots, or an irregularly shaped wearable device.

[0066] Combination Figures 1 to 5 Referring to the above description of the flexible display module, those skilled in the art should be able to understand the specific implementation structure of the flexible display module described in this application, which will not be described in detail here. The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0067] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A flexible display module, characterized in that, include: A support layer with a preset bending stiffness; A flexible display panel is disposed on the first surface of the support layer; A magnetic attraction component is disposed on a second surface of the support layer opposite to the first surface, and the magnetic attraction component is configured to magnetically connect with the target curved substrate. The magnetic attraction component includes a magnetic attraction unit and an elastic buffer unit, with the elastic buffer unit disposed around the magnetic attraction unit.

2. The flexible display module of claim 1, wherein, When the magnetic component is in a state of magnetic connection with the target curved substrate, the surface of the elastic buffer unit away from the support layer is flush with the surface of the magnetic unit away from the support layer, or the vertical distance between the surface of the elastic buffer unit away from the support layer and the second surface is less than the vertical distance between the surface of the magnetic unit away from the support layer and the second surface. 3.The flexible display module of claim 1, wherein, The number of magnetic components is multiple, and the multiple magnetic components are arranged in an array on the support layer, or the multiple magnetic components are distributed in a ring on the second surface along the edge region of the support layer.

4. The flexible display module of claim 1, wherein, The second surface of the support layer is provided with a window area corresponding to the magnetic attraction unit. The window area penetrates at least a portion of the thickness of the support layer, and a portion of the magnetic attraction unit is embedded in the window area. 5.The flexible display module of claim 4, wherein, The elastic buffer unit fills the gap between the magnetic unit and the sidewall of the window area. 6.The flexible display module of claim 1, wherein, The second surface of the support layer is further provided with a plurality of mutually separated rigid micro disks; wherein, the magnetic suction component is disposed in the region between the plurality of rigid micro disks, and the vertical distance between the surface of the rigid micro disk away from the support layer and the second surface is less than the vertical distance between the surface of the magnetic suction unit away from the support layer and the second surface. 7.The flexible display module of any one of claims 1 to 6, wherein, The flexible display module further includes a heat dissipation material layer disposed on the side of the support layer opposite to the flexible display panel, wherein the heat dissipation material layer has an opening that avoids the magnetic attraction component. 8.The flexible display module of any one of claims 1 to 6, wherein, The material used to make the support layer includes at least one of stainless steel foil, polyimide-metal composite foil, polyethylene terephthalate rigid backing plate, or nickel-iron alloy foil. 9.The flexible display module of claim 1, wherein, The magnetic attraction unit includes a neodymium iron boron magnet, and the elastic buffer unit includes a foam layer; The thickness of the neodymium iron boron magnet is between 0.05 mm and 0.15 mm, and the thickness of the foam layer is between 0.03 mm and 0.10 mm.

10. An electronic device, comprising: include: The flexible display module as described in any one of claims 1 to 9.

11. The electronic device of claim 10, wherein, The electronic device also includes a curved housing, and the flexible display module is detachably attached to the inner surface of the curved housing via the magnetic attachment component.

12. The electronic device of claim 11, wherein, The curved shell is made of iron-nickel alloy.

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